# UNS S44330 Stainless Steel

S44330 stainless steel is a ferritic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. It has a moderately high ductility and a fairly low tensile strength among wrought ferritic stainless steels.

The graph bars on the material properties cards below compare S44330 stainless steel to: wrought ferritic stainless steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

## Mechanical Properties

Brinell Hardness

160

Elastic (Young's, Tensile) Modulus

200 *GPa* 29 *x 10 ^{6} psi*

Elongation at Break

25 *%*

Fatigue Strength

160 *MPa* 23 *x 10 ^{3} psi*

Poisson's Ratio

0.27

Rockwell B Hardness

79

Shear Modulus

78 *GPa* 11 *x 10 ^{6} psi*

Shear Strength

280 *MPa* 40 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

440 *MPa* 63 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

230 *MPa* 34 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

290 *J/g*

Maximum Temperature: Corrosion

560 *°C* 1040 *°F*

Maximum Temperature: Mechanical

990 *°C* 1810 *°F*

Melting Completion (Liquidus)

1440 *°C* 2620 *°F*

Melting Onset (Solidus)

1390 *°C* 2540 *°F*

Specific Heat Capacity

480 *J/kg-K* 0.12 *BTU/lb-°F*

Thermal Conductivity

21 *W/m-K* 12 *BTU/h-ft-°F*

Thermal Expansion

10 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

2.7 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

3.1 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

13 *% relative*

Density

7.7 *g/cm ^{3}* 480

*lb/ft*

^{3}Embodied Carbon

2.8 *kg CO _{2}/kg material*

Embodied Energy

40 *MJ/kg* 17 *x 10 ^{3} BTU/lb*

Embodied Water

140 *L/kg* 17 *gal/lb*

## Common Calculations

PREN (Pitting Resistance)

22

Resilience: Ultimate (Unit Rupture Work)

91 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

140 *kJ/m ^{3}*

Stiffness to Weight: Axial

14 *points*

Stiffness to Weight: Bending

25 *points*

Strength to Weight: Axial

16 *points*

Strength to Weight: Bending

17 *points*

Thermal Diffusivity

5.7 *mm ^{2}/s*

Thermal Shock Resistance

16 *points*

## Alloy Composition

Among wrought stainless steels, the composition of S44330 stainless steel is notable for including titanium (Ti) and niobium (Nb). Titanium is used to broadly improve mechanical properties. Niobium is primarily used to improve yield strength, particularly at elevated temperatures.

Fe | 72.5 to 79.7 | |

Cr | 20 to 23 | |

Cu | 0.3 to 0.8 | |

Mn | 0 to 1.0 | |

Si | 0 to 1.0 | |

Nb | 0 to 0.8 | |

Ti | 0 to 0.8 | |

P | 0 to 0.040 | |

S | 0 to 0.030 | |

C | 0 to 0.025 | |

N | 0 to 0.025 |

All values are % weight. Ranges represent what is permitted under applicable standards.

## Followup Questions

## Similar Alloys

## Further Reading

ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications

Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

Corrosion of Stainless Steels, A. John Sedriks, 1996

ASM Specialty Handbook: Stainless Steels, J. R. Davis (editor), 1994

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010